/*
 * This file is part of JFlowMap.
 *
 * Copyright 2009 Ilya Boyandin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fons.util;

/**
 * @author Ilya Boyandin
 */
public class Pair<F,S> {

	private final F first;
	private final S second;

	public Pair(F first, S second) {
		this.first = first;
		this.second = second;
	}

	public F first() {
		return first;
	}

	public S second() {
		return second;
	}

	public final static <F,S> Pair<F,S> of(F first, S second) {
		return new Pair<F,S>(first, second);
	}


	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((first == null) ? 0 : first.hashCode());
		result = prime * result + ((second == null) ? 0 : second.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;

		@SuppressWarnings("unchecked")
		Pair<F,S> other = (Pair<F,S>) obj;
		if (first == null) {
			if (other.first != null)
				return false;
		} else if (!first.equals(other.first))
			return false;
		if (second == null) {
			if (other.second != null)
				return false;
		} else if (!second.equals(other.second))
			return false;
		return true;
	}

	public String toString()
	{
		return "Pair{"
				+ super.toString() + ", "
				+ "first = " + this.first + ", "
				+ "second = " + this.second
				+ "}";
	}

}

